If you know that A≠ 0 and B ≠0, how can you write an equation in point-slope form of the equation Ax+By=C

Aclothing designer is selecting models to walk the runway for her fashion show. the clothes she designed require each model’s height to be no more than y inches from 5 feet 10 inches, or 70 inches. which graph could be used to determine the possible variance levels that would result in an acceptable height, x?